DMCA
Dynamic Allocation of Subcarriers and 1 Transmit Powers in an OFDMA Cellular Network
BibTeX
@MISC{Hanly_dynamicallocation,
author = {Stephen V. Hanly and Lachlan L. H. Andrew and Thaya Thanabalasingham},
title = {Dynamic Allocation of Subcarriers and 1 Transmit Powers in an OFDMA Cellular Network},
year = {}
}
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Abstract
This paper considers the problem of minimizing outage probabilities in the downlink of a multiuser, multicell OFDMA cellular network with frequency selective fading, imperfect channel state information and frequency hopping. The task is to determine the allocation of powers and subcarriers for users to ensure that the user outage probabilities are as low as possible. We formulate a min-max outage probability problem and solve it under the constraint that the transmit power spectrum at each base station is flat. In particular, we obtain a subchannel allocation algorithm that has complexity O(L log L) in L, the number of users in the cell. We also consider suboptimal but implementable approaches with and without the flat transmit power spectrum constraint. We conclude that the flat transmit spectrum approach has merit, and warrants further study. Index Terms Cellular network, resource allocation, power control, orthogonal frequency division multiple access (OFDMA), subcarrier allocation, power spectrum, fading channels, outage capacity, fast frequency hopping, interference averaging. I.
Keyphrases
ofdma cellular network dynamic allocation transmit power orthogonal frequency division multiple access power control index term cellular network flat transmit spectrum approach frequency hopping flat transmit power spectrum constraint base station outage probability implementable approach resource allocation transmit power spectrum imperfect channel state information user outage probability interference averaging fast frequency hopping power spectrum subchannel allocation algorithm frequency selective fading min-max outage probability problem outage capacity
